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| 1 | <?php |
| 2 | /** |
| 3 | * Blocklog manager for the WAF |
| 4 | * |
| 5 | * @package automattic/jetpack-waf |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Waf; |
| 9 | |
| 10 | /** |
| 11 | * Class used to manage blocklog operations |
| 12 | */ |
| 13 | class Waf_Blocklog_Manager { |
| 14 | |
| 15 | const BLOCKLOG_OPTION_NAME_DAILY_SUMMARY = 'jetpack_waf_blocklog_daily_summary'; |
| 16 | const BLOCKLOG_OPTION_NAME_ALL_TIME_BLOCK_COUNT = 'jetpack_waf_all_time_block_count'; |
| 17 | |
| 18 | /** |
| 19 | * Database connection. |
| 20 | * |
| 21 | * @var \mysqli|null |
| 22 | */ |
| 23 | private static $db_connection = null; |
| 24 | |
| 25 | /** |
| 26 | * Gets the path to the waf-blocklog file. |
| 27 | * |
| 28 | * @return string The waf-blocklog file path. |
| 29 | */ |
| 30 | public static function get_blocklog_file_path() { |
| 31 | return trailingslashit( JETPACK_WAF_DIR ) . 'waf-blocklog'; |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * Connect to WordPress database. |
| 36 | * |
| 37 | * @return \mysqli|null |
| 38 | */ |
| 39 | private static function connect_to_wordpress_db() { |
| 40 | if ( self::$db_connection !== null ) { |
| 41 | return self::$db_connection; |
| 42 | } |
| 43 | |
| 44 | if ( ! file_exists( JETPACK_WAF_WPCONFIG ) ) { |
| 45 | return null; |
| 46 | } |
| 47 | |
| 48 | require_once JETPACK_WAF_WPCONFIG; |
| 49 | // @phan-suppress-next-line PhanUndeclaredConstant - These constants are defined in the wp-config file. |
| 50 | $conn = new \mysqli( DB_HOST, DB_USER, DB_PASSWORD, DB_NAME ); // phpcs:ignore WordPress.DB.RestrictedClasses.mysql__mysqli |
| 51 | |
| 52 | if ( $conn->connect_error ) { |
| 53 | error_log( 'Could not connect to the database:' . $conn->connect_error ); |
| 54 | return null; |
| 55 | } |
| 56 | |
| 57 | self::$db_connection = $conn; |
| 58 | return self::$db_connection; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Close the database connection. |
| 63 | * |
| 64 | * @return void |
| 65 | */ |
| 66 | private static function close_db_connection() { |
| 67 | if ( self::$db_connection ) { |
| 68 | self::$db_connection->close(); |
| 69 | self::$db_connection = null; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Serialize a value for storage in a WordPress option. |
| 75 | * |
| 76 | * @param mixed $value The value to serialize. |
| 77 | * @return string The serialized value. |
| 78 | */ |
| 79 | private static function serialize_option_value( $value ) { |
| 80 | return serialize( $value ); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Unserialize a value from a WordPress option. |
| 85 | * |
| 86 | * @param string $value The serialized value. |
| 87 | * @return mixed The unserialized value. |
| 88 | */ |
| 89 | private static function unserialize_option_value( string $value ) { |
| 90 | return unserialize( $value ); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Create the log table when plugin is activated. |
| 95 | * |
| 96 | * @return void |
| 97 | */ |
| 98 | public static function create_blocklog_table() { |
| 99 | global $wpdb; |
| 100 | |
| 101 | require_once ABSPATH . 'wp-admin/includes/upgrade.php'; |
| 102 | |
| 103 | $sql = " |
| 104 | CREATE TABLE {$wpdb->prefix}jetpack_waf_blocklog ( |
| 105 | log_id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, |
| 106 | timestamp datetime NOT NULL, |
| 107 | rule_id BIGINT NOT NULL, |
| 108 | reason longtext NOT NULL, |
| 109 | PRIMARY KEY (log_id), |
| 110 | KEY timestamp (timestamp) |
| 111 | ) |
| 112 | "; |
| 113 | |
| 114 | dbDelta( $sql ); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Write block logs to database. |
| 119 | * |
| 120 | * @param array $log_data Log data. |
| 121 | * |
| 122 | * @return void |
| 123 | */ |
| 124 | private static function write_blocklog_row( $log_data ) { |
| 125 | $conn = self::connect_to_wordpress_db(); |
| 126 | |
| 127 | if ( ! $conn ) { |
| 128 | return; |
| 129 | } |
| 130 | |
| 131 | global $table_prefix; |
| 132 | |
| 133 | $statement = $conn->prepare( "INSERT INTO {$table_prefix}jetpack_waf_blocklog(reason,rule_id, timestamp) VALUES (?, ?, ?)" ); |
| 134 | if ( false !== $statement ) { |
| 135 | $statement->bind_param( 'sis', $log_data['reason'], $log_data['rule_id'], $log_data['timestamp'] ); |
| 136 | $statement->execute(); |
| 137 | |
| 138 | if ( $conn->insert_id > 100 ) { |
| 139 | $conn->query( "DELETE FROM {$table_prefix}jetpack_waf_blocklog ORDER BY log_id LIMIT 1" ); |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Get the daily summary stats from the database. |
| 146 | * |
| 147 | * @return array The daily summary stats. |
| 148 | */ |
| 149 | private static function get_daily_summary() { |
| 150 | global $table_prefix; |
| 151 | $db_connection = self::connect_to_wordpress_db(); |
| 152 | if ( ! $db_connection ) { |
| 153 | return array(); |
| 154 | } |
| 155 | |
| 156 | $result = $db_connection->query( "SELECT option_value FROM {$table_prefix}options WHERE option_name = '" . self::BLOCKLOG_OPTION_NAME_DAILY_SUMMARY . "'" ); |
| 157 | if ( ! $result ) { |
| 158 | return array(); |
| 159 | } |
| 160 | |
| 161 | $row = $result->fetch_assoc(); |
| 162 | if ( ! $row ) { |
| 163 | return array(); |
| 164 | } |
| 165 | |
| 166 | $daily_summary = self::unserialize_option_value( $row['option_value'] ); |
| 167 | $result->free(); |
| 168 | |
| 169 | return is_array( $daily_summary ) ? $daily_summary : array(); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Increments the current date's daily summary stat. |
| 174 | * |
| 175 | * @param array $current_value The current value of the daily summary. |
| 176 | * |
| 177 | * @return array The updated daily summary. |
| 178 | */ |
| 179 | public static function increment_daily_summary( array $current_value ) { |
| 180 | $date = gmdate( 'Y-m-d' ); |
| 181 | $value = intval( $current_value[ $date ] ?? 0 ); |
| 182 | $current_value[ $date ] = $value + 1; |
| 183 | |
| 184 | return $current_value; |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Update the daily summary option in the database. |
| 189 | * |
| 190 | * @param array $value The value to update. |
| 191 | * |
| 192 | * @return void |
| 193 | */ |
| 194 | private static function write_daily_summary_row( array $value ) { |
| 195 | global $table_prefix; |
| 196 | $option_name = self::BLOCKLOG_OPTION_NAME_DAILY_SUMMARY; |
| 197 | |
| 198 | $db_connection = self::connect_to_wordpress_db(); |
| 199 | if ( ! $db_connection ) { |
| 200 | return; |
| 201 | } |
| 202 | |
| 203 | $updated_value = self::serialize_option_value( $value ); |
| 204 | |
| 205 | $statement = $db_connection->prepare( "INSERT INTO {$table_prefix}options (option_name, option_value) VALUES (?, ?) ON DUPLICATE KEY UPDATE option_value = ?" ); |
| 206 | if ( false !== $statement ) { |
| 207 | $statement->bind_param( 'sss', $option_name, $updated_value, $updated_value ); |
| 208 | $statement->execute(); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Update the daily summary stats for the current date. |
| 214 | * |
| 215 | * @return void |
| 216 | */ |
| 217 | private static function write_daily_summary() { |
| 218 | $stats = self::get_daily_summary(); |
| 219 | $stats = self::increment_daily_summary( $stats ); |
| 220 | $stats = self::filter_last_30_days( $stats ); |
| 221 | |
| 222 | self::write_daily_summary_row( $stats ); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Get the all-time block count value from the database. |
| 227 | * |
| 228 | * @return int The all-time block count. |
| 229 | */ |
| 230 | private static function get_all_time_block_count_value() { |
| 231 | global $table_prefix; |
| 232 | $db_connection = self::connect_to_wordpress_db(); |
| 233 | if ( ! $db_connection ) { |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | $result = $db_connection->query( "SELECT option_value FROM {$table_prefix}options WHERE option_name = '" . self::BLOCKLOG_OPTION_NAME_ALL_TIME_BLOCK_COUNT . "'" ); |
| 238 | if ( ! $result ) { |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | $row = $result->fetch_assoc(); |
| 243 | if ( ! $row ) { |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | $all_time_block_count = intval( $row['option_value'] ); |
| 248 | $result->free(); |
| 249 | |
| 250 | return $all_time_block_count; |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Update the all-time block count value in the database. |
| 255 | * |
| 256 | * @param int $value The value to update. |
| 257 | * @return void |
| 258 | */ |
| 259 | private static function write_all_time_block_count_row( int $value ) { |
| 260 | global $table_prefix; |
| 261 | $option_name = self::BLOCKLOG_OPTION_NAME_ALL_TIME_BLOCK_COUNT; |
| 262 | |
| 263 | $db_connection = self::connect_to_wordpress_db(); |
| 264 | if ( ! $db_connection ) { |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | $statement = $db_connection->prepare( "INSERT INTO {$table_prefix}options (option_name, option_value) VALUES (?, ?) ON DUPLICATE KEY UPDATE option_value = ?" ); |
| 269 | if ( false !== $statement ) { |
| 270 | $statement->bind_param( 'sii', $option_name, $value, $value ); |
| 271 | $statement->execute(); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Increment the all-time stats. |
| 277 | * |
| 278 | * @return void |
| 279 | */ |
| 280 | private static function write_all_time_block_count() { |
| 281 | $block_count = self::get_all_time_block_count_value(); |
| 282 | if ( ! $block_count ) { |
| 283 | $block_count = self::get_default_all_time_stat_value(); |
| 284 | } |
| 285 | |
| 286 | self::write_all_time_block_count_row( $block_count + 1 ); |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Filters the stats to retain only data for the last 30 days. |
| 291 | * |
| 292 | * @param array $stats The array of stats to prune. |
| 293 | * |
| 294 | * @return array Pruned stats array. |
| 295 | */ |
| 296 | public static function filter_last_30_days( array $stats ) { |
| 297 | $today = gmdate( 'Y-m-d' ); |
| 298 | $one_month_ago = gmdate( 'Y-m-d', strtotime( '-30 days' ) ); |
| 299 | |
| 300 | return array_filter( |
| 301 | $stats, |
| 302 | function ( $date ) use ( $one_month_ago, $today ) { |
| 303 | return $date >= $one_month_ago && $date <= $today; |
| 304 | }, |
| 305 | ARRAY_FILTER_USE_KEY |
| 306 | ); |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * Get the total number of blocked requests for today. |
| 311 | * |
| 312 | * @return int |
| 313 | */ |
| 314 | public static function get_current_day_block_count() { |
| 315 | $stats = get_option( self::BLOCKLOG_OPTION_NAME_DAILY_SUMMARY, array() ); |
| 316 | $today = gmdate( 'Y-m-d' ); |
| 317 | |
| 318 | return $stats[ $today ] ?? 0; |
| 319 | } |
| 320 | |
| 321 | /** |
| 322 | * Get the total number of blocked requests for last thirty days. |
| 323 | * |
| 324 | * @return int |
| 325 | */ |
| 326 | public static function get_thirty_days_block_counts() { |
| 327 | $stats = get_option( self::BLOCKLOG_OPTION_NAME_DAILY_SUMMARY, array() ); |
| 328 | $total_blocks = 0; |
| 329 | |
| 330 | foreach ( $stats as $count ) { |
| 331 | $total_blocks += intval( $count ); |
| 332 | } |
| 333 | |
| 334 | return $total_blocks; |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Get the total number of blocked requests for all time. |
| 339 | * |
| 340 | * @return int |
| 341 | */ |
| 342 | public static function get_all_time_block_count() { |
| 343 | $all_time_block_count = get_option( self::BLOCKLOG_OPTION_NAME_ALL_TIME_BLOCK_COUNT, false ); |
| 344 | |
| 345 | if ( false !== $all_time_block_count ) { |
| 346 | return intval( $all_time_block_count ); |
| 347 | } |
| 348 | |
| 349 | return self::get_default_all_time_stat_value(); |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Compute the initial all-time stats value. |
| 354 | * |
| 355 | * @return int The initial all-time stats value. |
| 356 | */ |
| 357 | private static function get_default_all_time_stat_value() { |
| 358 | $conn = self::connect_to_wordpress_db(); |
| 359 | if ( ! $conn ) { |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | global $table_prefix; |
| 364 | |
| 365 | $last_log_id_result = $conn->query( "SELECT log_id FROM {$table_prefix}jetpack_waf_blocklog ORDER BY log_id DESC LIMIT 1" ); |
| 366 | |
| 367 | $all_time_block_count = 0; |
| 368 | |
| 369 | if ( $last_log_id_result && $last_log_id_result->num_rows > 0 ) { |
| 370 | $row = $last_log_id_result->fetch_assoc(); |
| 371 | if ( $row !== null && isset( $row['log_id'] ) ) { |
| 372 | $all_time_block_count = $row['log_id']; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | return intval( $all_time_block_count ); |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * Get the headers for logging purposes. |
| 381 | * |
| 382 | * @return array The headers. |
| 383 | */ |
| 384 | public static function get_request_headers() { |
| 385 | $all_headers = getallheaders(); |
| 386 | $exclude_headers = array( 'Authorization', 'Cookie', 'Proxy-Authorization', 'Set-Cookie' ); |
| 387 | |
| 388 | foreach ( $exclude_headers as $header ) { |
| 389 | unset( $all_headers[ $header ] ); |
| 390 | } |
| 391 | |
| 392 | return $all_headers; |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * Write block logs. We won't write to the file if it exceeds 100 mb. |
| 397 | * |
| 398 | * @param string $rule_id The rule ID that triggered the block. |
| 399 | * @param string $reason The reason for the block. |
| 400 | * |
| 401 | * @return void |
| 402 | */ |
| 403 | public static function write_blocklog( $rule_id, $reason ) { |
| 404 | $log_data = array(); |
| 405 | $log_data['rule_id'] = $rule_id; |
| 406 | $log_data['reason'] = $reason; |
| 407 | $log_data['timestamp'] = gmdate( 'Y-m-d H:i:s' ); |
| 408 | $log_data['request_uri'] = isset( $_SERVER['REQUEST_URI'] ) ? \stripslashes( $_SERVER['REQUEST_URI'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash |
| 409 | $log_data['user_agent'] = isset( $_SERVER['HTTP_USER_AGENT'] ) ? \stripslashes( $_SERVER['HTTP_USER_AGENT'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash |
| 410 | $log_data['referer'] = isset( $_SERVER['HTTP_REFERER'] ) ? \stripslashes( $_SERVER['HTTP_REFERER'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash |
| 411 | $log_data['content_type'] = isset( $_SERVER['CONTENT_TYPE'] ) ? \stripslashes( $_SERVER['CONTENT_TYPE'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash |
| 412 | $log_data['get_params'] = json_encode( $_GET, JSON_UNESCAPED_SLASHES ); |
| 413 | |
| 414 | if ( defined( 'JETPACK_WAF_SHARE_DEBUG_DATA' ) && JETPACK_WAF_SHARE_DEBUG_DATA ) { |
| 415 | $log_data['post_params'] = json_encode( $_POST, JSON_UNESCAPED_SLASHES ); |
| 416 | $log_data['headers'] = self::get_request_headers(); |
| 417 | } |
| 418 | |
| 419 | if ( defined( 'JETPACK_WAF_SHARE_DATA' ) && JETPACK_WAF_SHARE_DATA ) { |
| 420 | $file_path = JETPACK_WAF_DIR . '/waf-blocklog'; |
| 421 | $file_exists = file_exists( $file_path ); |
| 422 | |
| 423 | if ( ! $file_exists || filesize( $file_path ) < ( 100 * 1024 * 1024 ) ) { |
| 424 | $fp = fopen( $file_path, 'a+' ); |
| 425 | |
| 426 | if ( $fp ) { |
| 427 | try { |
| 428 | fwrite( $fp, json_encode( $log_data, JSON_UNESCAPED_SLASHES ) . "\n" ); |
| 429 | } finally { |
| 430 | fclose( $fp ); |
| 431 | } |
| 432 | } |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | self::write_daily_summary(); |
| 437 | self::write_all_time_block_count(); |
| 438 | self::write_blocklog_row( $log_data ); |
| 439 | self::close_db_connection(); |
| 440 | } |
| 441 | } |